DISTRIBUTION CHARACTERS AND MODEL of RARE EARTH ELEMENT (REE) IN SURFACE SEDIMENTS FROM LINGDINGYANG AREA of PEARL RIVER ESTUARY
- 环境生态－已发表论文 
珠江口伶仃洋海区表层沉积物中的稀土元素的含量变化范围较大（170.34~344.60μg/g），平均含量为272.02μg/g，远高于陆壳平均含量（200μg/g）和华南地区花岗岩中稀土元素的平均含量，接近于全球沉积物平均稀土元素含量上限。以轻稀土富集为主，富集系数在1.51~2.43之间。经北美页岩标准化后，伶仃洋海区沉积物配分模式呈负斜率配分型；与南海沉积物中稀土分布具有相似性，说明二者具有同源性。The paper studies the content of Rare Earth Element(REE)in surface sediments from Pearl River Estuary.The content of REE changes from 170 34μg/g to 344 60μg/g.The average content of REE is 272 02μg/g,far higher than the average content of REE in crust and in granite of the South China area.It approaches the average upper limit of REE content in sediments in the world.The higher content of REE in surface sediments from Pearl River Estuary is related to sediment material source from Pearl River valley. The distribution model of REE in surface sediments from Pearl River Estuary shows negative slope model on the basis of standard of shale in North America (NASC).Ce shows a little positive anomaly,but Eu shows a little negative anomaly.The REE accumulation in surface sediments from Pearl River Estuary is mainly LREE accumulation, and the accumulating coefficient is 1 51～2 43.The accumulating degree in surface sediments of Pearl River Estuary is higher than that of Yellow River Estuary,Amazon Estuary and the South China Sea and less than that of East China Sea and Bohai Sea.The distribution model of South China Sea is similar to that of the continent shelf sea in China,especially to that of the South China Sea.It shows surface sediments in Pearl River Estuary have the same material source as in South China Sea. The TREE in surface sediments from Pearl River Estuary is closely related to clay mineral.Further analyzed,the LREE is closely related to kaolinite,MREE and HREE is closely related to gibbsite.But the reasons need further research.